Before you mentioned that it's for an airplane this made me think of the extra structure Tom Stanton added into his single-walled wing foils. He's using a foaming filament so that changes things I guess, but could this work for you? Apologies if you've already seen this https://www.youtube.com/watch?v=XPXN0QejqM0&t=555
Before you mentioned that it's for an airplane this made me think of the extra structure Tom Stanton added into his single-walled wing foils. He's using a foaming filament so that changes things I guess, but could this work for you? Apologies if you've already seen this https://www.youtube.com/watch?v=XPXN0QejqM0&t=555